Ottawa, Canada to Mexico City is an approximately 14-hour flight. The time zone difference moving from Eastern Standard Time to Central Standard Time is minus 1 hour. August in Mexico City sees daily highs of 28°C and lows of 16°C at night. Wrap up your sightseeing on the 2nd (Sat) to allow time to drive to San Miguel de Allende.

You can drive from Mexico City to San Miguel de Allende in 3.5 hours. Alternatively, you can do a combination of flight, taxi, and bus; or take a bus. While traveling from Mexico City, expect somewhat warmer days and about the same nights in San Miguel de Allende, ranging from highs of 31°C to lows of 15°C. Finish up your sightseeing early on the 3rd (Sun) so you can travel back home.